Best way to drain/change the coolant?

[wu11ie]

As above, I've tried searching but I can't find anything.

The coolant, if you can call it that, is the most horrible gunky colour you've ever seen and it REALLY needs changed.

What's the best way to drain it?,

My plan was to run it up to temp and take the return pipe off and feed it into a bucket whilst having a hose in the tank with a constant flow until the return pipe water runs clear, BUT........


would this work, and which pipe is the return pipe?

Thanks in advance

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